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Test Info:

<xul:titlebar id="a" style="overflow: auto;"/>↩
<script>↩
function doe() {↩
document.getElementsByTagName('*')[1].focus();↩
document.getElementsByTagName('*')[0].focus();↩
document.documentElement.removeAttribute("class");↩
}↩
setTimeout(doe, 200);↩
</script>↩
</html>↩